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Trajectory-Switching Algorithm for a MEMS Gyroscope
Park, Sungsu,Horowitz, Roberto,Hong, Sung Kyung,Nam, Yoonsu Institute of Electrical and Electronics Engineers 2007 IEEE transactions on instrumentation and measureme Vol.56 No.6
<P> The motion of a conventional force-balancingcontrolled gyroscope in a mode-matched operation does not have sufficient persistence of excitation, and as a result, all major fabrication imperfections cannot be identified and compensated for. This paper presents an adaptive force-balancing control for a microelectromechanical-system <TEX>$z$</TEX>-axis gyroscope using a trajectory-switching algorithm. The proposed adaptive forcebalancing control supplies additional richness of excitation to the internal dynamics of the gyroscope by switching the trajectory of the proof mass of the gyroscope, and it provides quadrature compensation, drive- and sense-axis frequency tuning, and closed-loop identification of the angular rate without the measurement of input/output phase difference. This algorithm also identifies and compensates the cross-damping terms which cause zero-rate output. </P>
Bionanoelectronic platform with a lipid bilayer/CVD-grown MoS<sub>2</sub> hybrid
Park, Yunjeong,Kang, Byunggil,Ahn, Cheol Hyoun,Cho, Hyung Koun,Kwon, Hyukjoon,Park, Sungsu,Kwon, Junhwan,Choi, Myunghwan,Lee, Changgu,Kim, Kyunghoon Elsevier 2019 Biosensors & bioelectronics Vol.142 No.-
<P><B>Abstract</B></P> <P>We demonstrate a bionanoelectronic platform for a supported lipid bilayer formed on an MoS<SUB>2</SUB> film for biosensing, biomolecule recognition, and bioelectronic applications. A large-area MoS<SUB>2</SUB> film was synthesized on a sapphire substrate and treated with O<SUB>2</SUB> plasma or Al<SUB>2</SUB>O<SUB>3</SUB> deposition to change the surface from hydrophobic to hydrophilic. Measurements of fluorescence and fluorescence recovery after photobleaching confirmed the physical properties of the lipid bilayer on the treated surfaces. We fabricated an electronic device using the treated MoS<SUB>2</SUB> film and characterized the influence of the lipid bilayer on its electrical properties. Furthermore, transmembrane ion channels peptide (gramicidin A) were incorporated into the lipid bilayer and modulations of the electrical properties of the device under various pH conditions and calcium ion were observed. This sensitive and stable platform has strong potential for housing artificial channels and transmembrane ion channels for advanced bioapplications.</P> <P><B>Highlights</B></P> <P> <UL> <LI> 2D bionanoelectronics based on lipid/MoS<SUB>2</SUB> hybrid was designed to monitor ion channel activity. </LI> <LI> Integration of lipid bilayer on a MoS<SUB>2</SUB> field effect transistor opens up potential utility of 2D nanomaterials for biosensing applications. </LI> <LI> Hybrid structure of MoS<SUB>2</SUB>/lipid bilayer with membrane peptides can provide a platform for designing interface between biology and electronics. </LI> </UL> </P> <P><B>Graphical abstract</B></P> <P>[DISPLAY OMISSION]</P>
Design of a Variable Stability Flight Control System
Sungsu Park,Joon Soo Ko 한국항공우주학회 2008 International Journal of Aeronautical and Space Sc Vol.9 No.1
A design objective for variable stability flight control system is to develop a controller of in-flight simulation capability that forces the aircraft being flown to follow the dynamics of other aircraft. This paper presents a model-following variable stability control system (VSS) for in-flight simulation which consists of feedforward and feedback control laws, the aircraft dynamic model to be simulated, and switching and fader logics to reduce the transient effect between two aircraft dynamics. The separate design techniques for feedforward and feedback control law proposals are based on model matching and augmented linear quadratic (LQ) techniques. The system allows pilots to select and engage VSS mode, and when deselected, the aircraft reverts to the baseline flight control system. Both the baseline flight control laws and VSS control laws are computed continuously during flight. Initialization of the state values are necessary to prevent instability, since VSS control laws have integrators and filters in longitudinal, and lateral/directional axes. This paper demonstrates and validates the effectiveness and quality of VSS with F-16 models embedded in T-50 in-flight simulation aircraft.
Park Arum,Lee Eun,Park Hyojung,Park Mee-Na,Lee Jiho,Song Kun Baek,Yoon Jisun,Jung Sungsu,Suh Nayoung,Yoon Jin,Yu Jinho 대한의학회 2021 Journal of Korean medical science Vol.36 No.40
Background: Atopic dermatitis (AD) is a chronic and relapsing inflammatory skin disease mediated by T helper type 2 (Th2) cells in acute phase. Group 2 innate lymphoid cells (ILCs) play a role in the initiation of the Th2 response. Although mold exposure is associated with the development of AD, studies on the underlying mechanisms are lacking. This study investigated whether group 2 ILCs are involved in inflammation in AD-like skin induced by Aspergillus fumigatus (Af). Methods: We investigated changes of group 2 ILCs population in Af-induced AD-like skin lesions. To induce AD-like skin lesions, Af extracts were applied to the dorsal skin of BALB/c and Rag1−/− mice five times per week, with repeat exposures at 2-week intervals. Results: The clinical parameters were higher in the Af-treated group than in the control group. Histologic findings revealed epiderrmal and dermal thickening as well as eosinophil and mast cell infiltration into the skin of Af-treated mice. Populations of group 2 ILCs in the skin were also significantly higher in the Af-treated group. In addition, interleukin-33 mRNA expression was significantly higher in the skin lesions of the Af-treated mice. In the Rag1−/− mice lacking mature lymphocytes, AD-like skin lesions were still induced by Af and ILCs depletion using an anti-CD90.2 mAb lowered the Af-induced inflammatory response. Conclusions: Group 2 ILCs may play a role in a murine model of Af-induced AD-like skin lesions.
박성수(Sungsu Park) 제어로봇시스템학회 2009 제어·로봇·시스템학회 논문지 Vol.15 No.3
This paper presents two control algorithms for the frequency and amplitude of the resonator of a micro sensor. One algorithm excites the resonator at its a priori unknown resonant frequency, and the other algorithm alters the resonator dynamics to place the resonant frequency at a fixed frequency, chosen by the designer. Both algorithms maintain a specified amplitude of oscillations. The control system behavior is analyzed using an averaging method, and a quantitative criterion is provided for the selecting the control gain to achieve stability. Tracking and estimation accuracy of the natural frequency under the presence of measurement noise is also analyzed. The proposed control algorithms are applied to the MEMS dual-mass gyroscope without mechanical connecting beam between two proof-masses. Simulation results show the effectiveness of the proposed control algorithms which guarantee the proof-masses of the gyroscope to move in opposite directions with the same resonant frequency and oscillation amplitude.